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USMLE/1
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Introduction
1. Anatomy
2. Microbiology
2.1 General bacteriology
2.2 Introduction to systemic bacteriology
2.3 Gram positive cocci
2.4 Gram negative cocci
2.5 Gram positive bacilli
2.5.1 Introduction
2.5.2 Bacillus anthracis
2.5.3 Bacillus cereus
2.5.4 Clostridium tetani
2.5.5 Clostridium botulinum
2.5.6 Clostridium perfringens
2.5.7 Clostridium difficile
2.5.8 Corynebacterium diphtheriae
2.5.9 Listeria monocytogenes
2.6 Gram negative bacilli
2.7 Other important bacteria
2.8 Virology
2.9 Parasitology
2.10 Mycology
3. Physiology
4. Pathology
5. Pharmacology
6. Immunology
7. Biochemistry
8. Cell and molecular biology
9. Biostatistics and epidemiology
10. Genetics
11. Behavioral science
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2.5.1 Introduction
Achievable USMLE/1
2. Microbiology
2.5. Gram positive bacilli

Introduction

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Gram-positive bacilli (rods) of medical importance include Clostridia, Bacillus species, Listeria, and Corynebacteria. Actinomycetes and Nocardia are also gram-positive, branching filamentous bacteria; you’ll cover them later along with Mycobacteria.

Bacteria in the genera Bacillus and Clostridia form endospores that contain dipicolinic acid. These spores are highly resistant to extreme environmental conditions, including heat, freezing, drying, and radiation. Because of this resistance, spores can persist in the environment for thousands of years or longer.

Diagnosis of gram positive rods
Diagnosis of gram positive rods

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